Forums > Windsurfing   Gps and Speed talk

5 X 10sec

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Created by decrepit > 9 months ago, 3 Aug 2007
decrepit
WA, 12767 posts
3 Aug 2007 7:30PM
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On our 1st Aug sesh, wind was light but found a nice gust and went for a downwind nautical mile anyway. Struggled to get back upwind and then the wind dropped.

Was very surprised when I loaded the data into realspeed to find the nautical mile faster than the 5 X 10sec 26.399 for NM, 25.87 for 5 X 10.

The NM takes about 2min, 5 X 10 is only 50sec so how can it be less????

Turns out that only 1 10sec result is taken from each run by default.
If I untick the box that says "one result per run" I get a 5 X 10 of 28kn, as it takes four 10 sec periods from the NM and the 5th from my next fastest run.

Guess it doesn't make a lot of difference most of the time, just surprised that it works this way.

I don't think we should change it, that would just make for confusion, but just be aware, that you need 5 good runs to get a good 5 X 10, One long one won't do.

vando
QLD, 3418 posts
3 Aug 2007 10:06PM
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Maybe you got one good 10sec and the rest not.
Remember nm is only one run could have been a gust on that run.
Example you might go sailing only get one run and the wind drop.
nm will be good but 10sec will be nothing.
hope that makes sense.

decrepit
WA, 12767 posts
3 Aug 2007 8:45PM
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I guess I'm just getting old and ramble too much, but that's just what I was trying to say!!!!!

25
WA, 319 posts
3 Aug 2007 8:54PM
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GPS-SS has been 'one result per run' since day one Decrep!

decrepit
WA, 12767 posts
3 Aug 2007 9:15PM
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Not only am I old, but I'm behind the times as well!



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"5 X 10sec" started by decrepit